Desktop Computer running slow at Warwick

This morning we are with a customer in Warwick to repair their computer system, after cleaning it up and checking its decided that the memory on the machine needs upgrading to GB to make it work well with the software being used, Typically Windows XP uses no more than 512MB unless its installed with Photoshop, Windows Vista and 7 Require 2GB just to run efficiently any thing above 4GB is good but as always more is better (The 32bit Versions are limit to a max of 3.5GB RAM).